提交表单后关闭标签页

Question

我的插件的目标是执行以下操作：

1. 打开指定网址的新标签页
2. 将内容插入表单
3. 提交该表格

4. 关闭已打开的标签页

   插件能够完成第1步和第2步。但是，它会以适当的顺序一起执行第3步和第4步的问题。

Main.js

var data = require("sdk/self").data;
var tabs = require("sdk/tabs");

console.log("Step 1: addon started");
// Creates the button
require("sdk/ui/button/action").ActionButton({
  id: "make-post",
  label: "Make post",
  icon: {
    "16": "./icon-16.png",
    "32": "./icon-32.png",
    "64": "./icon-64.png"
  },
  onClick: handleClick
});

function handleClick(state) {
console.log("Step 9: handleClick started");
tabs.open(sites.urls[0]);
handleTab(0);
}
//this is our cargo.
var Cargo = {
    Title: "Sample Title!",
    Content: new Date()
};
//this is in an array for a good reason. don't worry about it.
var sites = {
urls: ["http://pastebin.com/"],
scripts: ["postPB.js"]
};

function handleTab(X) 
{
//I tried tabs.on('load'.. and that didn't fix the problem
    tabs.on('ready', function RunPostScript(tab) 
    {
        console.log("The tab is ready");
        worker = tab.attach(
        {
              contentScriptFile: sites.scripts[X],
              contentScriptOptions: 
              {
                Cargo
              }
        });
        worker.port.once("myMessage", function handleMyMessage() 
        {
            console.log("Shuttin down!");
            tab.close();
            worker.destroy();
        });
        tabs.removeListener("ready", RunPostScript);
    });
}  

PostPB.js

//the listener that should close the tab after submit
document.addEventListener("submit", function(event) {
console.log("Unloading now");
self.port.emit("myMessage");
}, false);

//this inserts the post title
var titlePort = function(x)
{
    var zA = document.querySelector(".post_input");
    //this sets the paste to expire in 10 minutes
    document.querySelector("div.form_frame:nth-child(2) > div:nth-child(2) > select:nth-child(1) > option:nth-child(1)").value="10M";
    zA.value = x;
    console.log("Title inserted");
};
//this inserts the post content
var contentPort = function(x)
{
    var zA = document.querySelector("#paste_code");
    zA.value = x;
    console.log("Content inserted");
};

//hits the submit button
var ShipIt = function()
{
    document.querySelector("#submit").click()
    //self.port.emit("myMessage");
};

//this excecutes all the functions in a specified sequence
var Finalize = function()
{
    titlePort(self.options.Cargo.Title);
    contentPort("Test: " + self.options.Cargo.Content + ". If this post is visible, the test was successful.");
    ShipIt();
};

Finalize();

问题

每当postPB.js提交表单时，它都会向Main.js发送一条消息，以关闭该标签。但是，Main.js关闭选项卡，然后页面上的submit可以在服务器端完成。

我找到了a question for a very similar problem。但他们使用的是php，所以我不认为他们的解决方案对我有用。

我的问题

在服务器端提交表单后，有没有办法从Main.js关闭标签？